Window screen frame with rectangular flange



FIG. 1 is a perspective view of a window screen frame with rectangular flange showing a mesh in broken lines for illustrative purposes only, and forms no part of the claimed design;

FIG. 2 is a front view thereof;

FIG. 3 is a back view thereof; and,

FIG. 4 is a side view thereof. 

The ornamental design for a window screen frame with rectangular flange, as shown and described. 